Example

Title: Determine the value of the expression by substituting the variable value

Grade: 8-a Lesson: S1-L8

Explanation: The best way to understand algebra is by looking at some examples. Take turns and read each example for easy understanding.

Examples:

1. Determine the value of expression \$2 + 3b + 4b^2\$ when b = 2.

Step 1a

The given expression is, \$2 + 3b + 4b^2\$.

Explanation: The given expression is, \$2 + 3b + 4b^2\$.

The expression contains variable in 'b'.

Step 1b

Substitute the values of the variables in the expression.

Explanation: Substitute the values of the variables and perform operations.

Perform operations according to PEMDAS rule.

⇒ \$2 + 3b + 4b^2 \$

⇒ \$2 + 3(2) + 4(2)^2 \$

⇒ \$2 + 3(2) + 4(4)\$

⇒ \$2 + 6 + 16 \$

⇒ \$24\$


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